crypto/bf/bf_locl.h

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifndef HEADER_BF_LOCL_H
  11 # define HEADER_BF_LOCL_H
  12 # include <openssl/opensslconf.h>
  13
  14 /* NOTE - c is not incremented as per n2l */
  15 # define n2ln(c,l1,l2,n) { \
  16                         c+=n; \
  17                         l1=l2=0; \
  18                         switch (n) { \
  19                         case 8: l2 =((unsigned long)(*(--(c))))    ; \
  20                         /* fall thru */                              \
  21                         case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
  22                         /* fall thru */                              \
  23                         case 6: l2|=((unsigned long)(*(--(c))))<<16; \
  24                         /* fall thru */                              \
  25                         case 5: l2|=((unsigned long)(*(--(c))))<<24; \
  26                         /* fall thru */                              \
  27                         case 4: l1 =((unsigned long)(*(--(c))))    ; \
  28                         /* fall thru */                              \
  29                         case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
  30                         /* fall thru */                              \
  31                         case 2: l1|=((unsigned long)(*(--(c))))<<16; \
  32                         /* fall thru */                              \
  33                         case 1: l1|=((unsigned long)(*(--(c))))<<24; \
  34                                 } \
  35                         }
  36
  37 /* NOTE - c is not incremented as per l2n */
  38 # define l2nn(l1,l2,c,n) { \
  39                         c+=n; \
  40                         switch (n) { \
  41                         case 8: *(--(c))=(unsigned char)(((l2)    )&0xff); \
  42                         /* fall thru */                                    \
  43                         case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
  44                         /* fall thru */                                    \
  45                         case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
  46                         /* fall thru */                                    \
  47                         case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
  48                         /* fall thru */                                    \
  49                         case 4: *(--(c))=(unsigned char)(((l1)    )&0xff); \
  50                         /* fall thru */                                    \
  51                         case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
  52                         /* fall thru */                                    \
  53                         case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
  54                         /* fall thru */                                    \
  55                         case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
  56                                 } \
  57                         }
  58
  59 # undef n2l
  60 # define n2l(c,l)        (l =((unsigned long)(*((c)++)))<<24L, \
  61                          l|=((unsigned long)(*((c)++)))<<16L, \
  62                          l|=((unsigned long)(*((c)++)))<< 8L, \
  63                          l|=((unsigned long)(*((c)++))))
  64
  65 # undef l2n
  66 # define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
  67                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  68                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  69                          *((c)++)=(unsigned char)(((l)     )&0xff))
  70
  71 /*
  72  * This is actually a big endian algorithm, the most significant byte is used
  73  * to lookup array 0
  74  */
  75
  76 # define BF_ENC(LL,R,S,P) ( \
  77         LL^=P, \
  78         LL^=((( S[       ((R>>24)&0xff)] + \
  79                 S[0x0100+((R>>16)&0xff)])^ \
  80                 S[0x0200+((R>> 8)&0xff)])+ \
  81                 S[0x0300+((R    )&0xff)])&0xffffffffU \
  82         )
  83
  84 #endif